HD64F38602R Datasheet, PDF (157/552 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

Section 8 I/O Ports
8.2.1 Port Data Register 3 (PDR3)
PDR3 is a register that stores data of port 3.
Bit
7 to 3
Initial
Bit Name Value R/W



2
P32
0
R/W
1
P31
0
R/W
0
P30
0
R/W
Description
Reserved
The read value is undefined. These bits cannot be
modified.
If port 3 is read while PCR3 bits are set to 1, the values
stored in PDR3 are read, regardless of the actual pin
states. If port 3 is read while PCR3 bits are cleared to 0,
the pin states are read.
8.2.2 Port Control Register 3 (PCR3)
PCR3 selects inputs/outputs in bit units for pins to be used as general I/O ports of port 3.
Bit
7 to 3
Initial
Bit Name Value R/W



2
PCR32 0
W
1
PCR31 0
W
0
PCR30 0
W
Description
Reserved
The read value is undefined. These bits cannot be
modified.
Setting a PCR3 bit to 1 makes the corresponding pin
(P32 to P30) an output pin, while clearing the bit to 0
makes the pin an input pin. The settings in PCR3 and in
PDR3 are valid when the corresponding pin is
designated as a general I/O pin.
PCR3 is a write-only register. The read value is
undefined.
Rev. 3.00 May 15, 2007 Page 125 of 516
REJ09B0152-0300